|Publication number||US7498538 B1|
|Application number||US 11/880,248|
|Publication date||Mar 3, 2009|
|Filing date||Jul 20, 2007|
|Priority date||Jul 20, 2007|
|Publication number||11880248, 880248, US 7498538 B1, US 7498538B1, US-B1-7498538, US7498538 B1, US7498538B1|
|Inventors||Michael D. Tittle|
|Original Assignee||Judco Manufacturing, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (105), Non-Patent Citations (3), Classifications (5), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to an electrical system, and in particular to an electrical switch.
Electrical switches are used to make electrical connections between electrical wires. Many electrical system failures result from bad contacts at electrical switches. The bad contacts may result from contaminations at contact surfaces or terminals, or may result from wearing of the contact surfaces and/or terminals.
The present invention provides a method and system for making a reliable and durable contact between electrical terminals.
In one aspect, an electrical contact assembly according to an embodiment of the present invention includes an electrical terminal, a push button, and a contact member. When the push button is compressed, the contact member comes in electrical contact with the terminal. The contact member has a first contact portion forming a first angle with a surface of the electrical terminal, and a second contact portion forming a second angle with the surface of the electrical terminal. The second angle is smaller than the first angle, and the second contact portion is adapted to slide on the surface of the electrical terminal when the push button is compressed.
The electrical contact assembly may include a spring member coupled to the contact member and to the push button. The assembly may have a housing and a cover together substantially enclosing the electrical terminal and the contact member. The electrical terminal may be adapted for retaining, and being in electrical contact with, an electrical wire.
The contact member of the assembly may be formed unitarily, for example, using beryllium copper. Alternatively, portions of the contact member may be formed separately and then coupled together.
The contact member is adapted to provide a resilient force between the contact member and the electrical terminal when in electrical contact with the electrical terminal. The resilient force at least partially results from a change in a relative angle between the first contact portion and the second contact portion.
These and other features, aspects and advantages of the present invention will become understood with reference to the following description, appended claims and accompanying figures.
The present invention provides a switch for connecting, for example, paired electrical wires. As shown in
The terminals 11 a and 11 b have retaining portions 11 a-2 and 11 b-2 that are adapted to retain electrical wires 101 a and 101 b (e.g.,
The contact member 13 has a first contact portion 13 a and a second contact portion 13 b. The second contact portion 13 b as shown is at an angle in relation to the first contact portion 13 a, i.e., the portion 13 b is “bent” in relation to the portion 13 a. The second contact portion 13 b is adapted to come in contact with a surface 11 a-1 of the first terminal 11 a. The contact member 13 may further include a third contact portion 13 c and a fourth contact portion 13 d. The fourth contact portion 13 d is bent in relation to portion 13 c, and is adapted to come in contact with a surface 11 b-1 of the second terminal 11 b.
The contact member 13 is overall “U” shaped, with contact portions 13 a and 13 b forming a first “leg” 13-1, and contact portions 13 c and 13 d forming a second “leg” 13-2. The contact member 13 may also be of other shapes such as “V” shaped, etc. The contact member 13 may have more “legs” and contact portions, and may be unitarily formed using, for example, beryllium copper. Alternatively, different portions, such as the first contact portion 13 a and the second contact portion 13 b, may be formed separately and then coupled together.
The push button 14 has an internal extrusion 14 a adapted to extend through an aperture 13 f of the top portion 13 e of the contact member 13, and extend through a first portion of the spring member 12 thus retaining the first portion of the spring member 12 to a substantially fixed location. For a contact member 13 having a width of about 3.15 mm at the top portion 13 e, the aperture 13 f has a diameter of about 1.52 mm.
The housing 16 has an aperture 16 a adapted to have the push button 14 extend therethrough. As shown in
As shown in
The second contact portion 13 b forms a second angle β with the surface 11 a-1 of the terminal 11 a. The second angle β is smaller than the first angle α, i.e., 0°<β<α, and preferably is about 25°. The first portion 13 a and the second portion 13 b form a relative angle γ=180°−α+β, which is preferably about 130°.
In one exemplary implementation, the second portion 13 b is angled (bent) about γ=130° from the first contact portion 13 a. In other words, the second portion 13 b is angled (bent) about 50° vertically from the first contact portion 13 a.
As shown in
The contact assembly 10 remains closed (providing electrical connection between the terminals 11 a, 11 b) so long as the spring member 12 remains compressed, allowing the contact member 13 to maintain electrical contact with both the terminals 11 a and 11 b.
As illustrated in
The relative angle between the contact portions 13 a and 13 b decreases until the angle γ′=180−α′ as shown, where the angle α′ between the contact portion 13 a and the surface 11 a-1 may also have decreased, depending on the flexibility between the portion 13 a and the top portion 13 e of the contact member 13.
As shown earlier in
The tapered width of the contact member 13 provides a softer resilient force between the contact portions 13 a and 13 b as compared with the resilient force between the top portion 13 e and the contact portion 13 a when the contact member 13 is compressed. Thus, it is easier to bend the second contact portion 13 b from the first contact portion 13 a as compared with bending the first contact portion 13 a from the top contact portion 13 e. As illustrated in
As shown in
The resilient force causes an outwardly sliding tendency of the second portion 13 b on the surface 11 a-1. When the sliding tendency overcomes the friction between the second portion 13 b and the surface 11 a-1, at least a tip of the second contact portion 13 b slides outwardly on the surface 11 a-1, in the direction shown as a block arrow 71 in
Even after repetitive open and close state cycles of the contact 20 assembly (switch 10) such that wearing on the contact portions 13 b, 13 d and the surfaces 11 a-1 and 11 b-1 may occur, proper electrical contact may still be ensured as a result of the range of relative positions (between position 23 and position 33) the contact member 13 can move while trying to make electrical contact with terminals 11 a and 11 b. Thus, the contact assembly 10 of the invention provides a reliable electrical connection through the “self cleaning” function and the range of contact positions.
As noted, when the push button 14 is pressed, the spring member 12 is compressed. When the push button 14 is partially released, the second portion 13 b slides back on the surface 11 a-1 of the terminal 11 a as a result of the resilient force between the contact member 13 and the surface 11 a-1. When the push button 14 is further released, the contact member is moved by the spring member 12 passing the second position 23, and the second portion 13 b breaks electrical contact with the surface 11 a-1.
In another embodiment of the present invention, the push button 14 may be locked into one or more lock positions using mechanisms known in the art.
As shown in
Advantageously, the invention provides a reliable and durable electrical switch. The switch has a “self-cleaning” function that helps maintain a reliable electrical connection.
The present invention has been described in considerable detail with reference to certain preferred versions thereof; however, other versions are possible.
For example, those of ordinary skill in the art will recognize that many design variations of the contact member 13 may exist without departing the scope of the invention. The contact member 13 may have more “legs,” and each leg may include more than two portions having different relative angles with respect to the corresponding electrical terminal. The dimensions and the materials of the portions may vary.
In addition, the different portions may be made separately and then coupled together. Moreover, although the contact member 13 as shown has two, symmetrical legs each having two portions, the legs may be configured asymmetrically. Moreover, although the contact member as shown in the drawings is “bent” outwardly, it is possible that it can be designed to be bent inwardly; so long the terminals are slanted inwardly accordingly.
Therefore, the spirit and scope of the appended claims should not be limited to the description of the preferred versions contained herein.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US2355459||Sep 29, 1942||Aug 8, 1944||Miskella William J||Apparatus for drying helmets and the like|
|US2422097||May 19, 1945||Jun 10, 1947||Cutler Hammer Inc||Electric switch|
|US2478564||Oct 25, 1946||Aug 9, 1949||Cons Vultee Aircraft Corp||Electric switch|
|US2966561||Oct 8, 1959||Dec 27, 1960||United Mfg Company||Magnetic electric switch for games|
|US3012219||Mar 19, 1959||Dec 5, 1961||Minnesota Mining & Mfg||Solderless connector for insulated small wires|
|US3204067||Dec 26, 1962||Aug 31, 1965||Boyne Products Inc||Push rotary switch construction with lost motion contact coupling|
|US3226991||Dec 17, 1962||Jan 4, 1966||United Carr Fastener Corp||Indexing device for a rotary snap switch|
|US3329784||Jun 20, 1966||Jul 4, 1967||Jean Rogero||Electrical snap switch with improved guide means|
|US3445796||Oct 21, 1966||May 20, 1969||Eichner Org Gmbh||Arrangement for signalling movement of a member by means of a magnet movable past a reed switch|
|US3454733||Jun 21, 1967||Jul 8, 1969||Texas Instruments Inc||Three position snap-acting toggle switch|
|US3463491||Jan 26, 1966||Aug 26, 1969||Albert E Shaw||Pin detection system with radially symmetrical pattern of magnetic reed switches|
|US3472721||Jan 24, 1966||Oct 14, 1969||Research Inc||Apparatus for lap joinder of plastic sheets|
|US3509317||Aug 1, 1967||Apr 28, 1970||North American Rockwell||Indirect radiant heat soldering apparatus|
|US3510069||May 8, 1968||May 5, 1970||Crosby Res Inc||Water flow and garbage disposal control system|
|US3523168||Jul 26, 1968||Aug 4, 1970||Robertshaw Controls Co||Pushbutton switch construction with positive plunger safety stop carried by a casing|
|US3535478||Feb 5, 1968||Oct 20, 1970||Lucas Industries Ltd||Multicircuit electrical switches|
|US3588425||Jul 3, 1969||Jun 28, 1971||Control Data Corp||Dual source radiation bonding of plural joints|
|US3591747||Dec 29, 1969||Jul 6, 1971||Arrow Hart Inc||Lever operated switch with tiltable contact actuator and flexible contacts|
|US3592992||Mar 13, 1969||Jul 13, 1971||Argus Eng Co||Soldering method and apparatus|
|US3598948||Apr 24, 1970||Aug 10, 1971||Gen Electric||Miniature square oiltight pushbutton switch|
|US3600553||Sep 16, 1969||Aug 17, 1971||Argus Eng Co||Method and apparatus for heating a plurality of closely spaced discrete zones by a single energy source|
|US3649811||Jul 24, 1969||Mar 14, 1972||Western Electric Co||Radiant energy soldering|
|US3657508||Nov 18, 1970||Apr 18, 1972||Western Electric Co||Method of and radiant energy transmissive member for reflow soldering|
|US3668579||Nov 9, 1970||Jun 6, 1972||Door Alarm Device Corp||Magnetic door alarm|
|US3674974||Oct 9, 1970||Jul 4, 1972||Argus Eng Co||Heating & fusing device|
|US3674975||Nov 6, 1969||Jul 4, 1972||Time Research Lab Inc||Apparatus for assembling stacks|
|US3694603||Sep 29, 1971||Sep 26, 1972||Buttner Horace||Push-push switch with improved alternate make and break latching mechanism|
|US3744557||Jul 19, 1971||Jul 10, 1973||Argus Eng Co||Apparatus for fusing and sealing platings and the like|
|US3760312||Oct 20, 1972||Sep 18, 1973||Shlesinger B||Magnetically actuated reed switch assembly|
|US3763348||Jan 5, 1972||Oct 2, 1973||Argus Eng Co||Apparatus and method for uniform illumination of a surface|
|US3788560||Oct 16, 1972||Jan 29, 1974||Gte Sylvania Inc||Lighting fixture|
|US3790912||Oct 2, 1972||Feb 5, 1974||Murphy J||Flashlight and switch assembly|
|US3801753||Jun 30, 1970||Apr 2, 1974||Gaf Corp||Dial type wafer printed circuit switch|
|US3809838 *||Nov 1, 1971||May 7, 1974||Bunker Ramo||Modular push button switch assembly mounted on printed circuit board|
|US3899236||Jun 24, 1974||Aug 12, 1975||Amerace Corp||Electrical connector|
|US3910672||Jun 3, 1974||Oct 7, 1975||Amp Inc||Replacement cover for electrical wiring devices|
|US3931487||Jun 25, 1974||Jan 6, 1976||Etablissements Russenberger||Electric momentary action push-button switch|
|US3974469||Feb 13, 1975||Aug 10, 1976||The Mettoy Company Limited||Permanent magnet biasing means for reed switches|
|US3993885||Jan 28, 1975||Nov 23, 1976||Matsushita Electric Industrial Co., Ltd.||Pan detector for an induction heating apparatus|
|US4006322 *||Sep 22, 1975||Feb 1, 1977||Allis-Chalmers Corporation||Auxiliary interlock switch with interchangeable and reversible chisel-shaped contacts and spring biasing mechanism|
|US4019801||Jan 19, 1976||Apr 26, 1977||Amp Incorporated||Electrical splice|
|US4041427||Oct 6, 1975||Aug 9, 1977||Futaba Denshi Kogyo K. K.||Reed switching opening and closing device|
|US4052580 *||Sep 24, 1976||Oct 4, 1977||Amf Incorporated||Momentary contact pushbutton type switch having flexible, mounted housing|
|US4055736||Dec 18, 1975||Oct 25, 1977||Peter Congelliere||Push switch|
|US4062626||Sep 5, 1975||Dec 13, 1977||Hitachi, Ltd.||Liquid crystal display device|
|US4089047||Sep 23, 1976||May 9, 1978||Willy Luderitz||Trifocal mirror-reflector|
|US4152755||Jun 20, 1977||May 1, 1979||Nixt Richard E||Portable magnetically actuatable flashlight|
|US4169974||Mar 30, 1978||Oct 2, 1979||Amf Incorporated||Push operated momentary switch|
|US4175222||Jan 22, 1978||Nov 20, 1979||Buttner Horace Judson||Pushbutton switch|
|US4203017||Jul 24, 1978||May 13, 1980||Integrated Electronics Corporation||Electric switch|
|US4241244||Dec 22, 1977||Dec 23, 1980||Swann David A||Electric switches|
|US4252395||Jan 2, 1979||Feb 24, 1981||Gte Automatic Electric Laboratories Inc.||Terminal apparatus for interconnecting two or more insulated electrical conductors|
|US4308440||Nov 30, 1979||Dec 29, 1981||Buttner Horace Judson||Switch contact positioning assembly|
|US4317015||Nov 30, 1979||Feb 23, 1982||Horace J. Buttner||Multi-circuit switch assembly|
|US4319106||Mar 31, 1980||Mar 9, 1982||Armitage Ralph T||Push button switch|
|US4335287||Mar 16, 1981||Jun 15, 1982||Eaton Corporation||Lever seal for miniature sealed toggle switch|
|US4345128||May 15, 1980||Aug 17, 1982||Buttner Horace Judson||Electrical contact positioning assembly|
|US4413872||May 11, 1981||Nov 8, 1983||Amp Incorporated||Preloaded electrical connector|
|US4419169||Mar 23, 1982||Dec 6, 1983||Baxter Travenol Laboratories, Inc.||Apparatus for radiant heat sealing of balloon onto catheter shaft|
|US4419304||Jul 15, 1980||Dec 6, 1983||Western Electric Company, Inc.||Method for forming seals with heat shrinkable materials|
|US4460820||Jul 21, 1982||Jul 17, 1984||Nippon Telegraph & Telephone Public Corporation||Apparatus for heating heat-shrinkable tubes|
|US4461528||Jan 19, 1982||Jul 24, 1984||Legrand||Electrical connector for insulated conductors|
|US4476359||Sep 30, 1982||Oct 9, 1984||Leviton Manufacturing Company, Inc.||Push-button electrical switch with unitary spiral stem and washer|
|US4496803 *||May 4, 1983||Jan 29, 1985||Key Concepts, Incorporated||Data entry switch|
|US4506124||Oct 19, 1983||Mar 19, 1985||Amp Incorporated||Push-push switch|
|US4524253||Apr 2, 1984||Jun 18, 1985||Carlingswitch, Inc.||Three position switch construction|
|US4529258||Mar 2, 1983||Jul 16, 1985||Challenger Circle F Inc.||Electric lamp socket assembly having stripless wiring terminals|
|US4541679||Jul 13, 1983||Sep 17, 1985||Karl Lumberg Gmbh & Co.||Electrical connector strip|
|US4575590||Jul 27, 1984||Mar 11, 1986||Kabushikikaisha Tokairikadenkiseisakusho||Thrust-in operation type switching device|
|US4605839||Dec 21, 1984||Aug 12, 1986||Adolph Coors Company||Dual parison heating reflector and method|
|US4660919||Oct 7, 1985||Apr 28, 1987||Beacon Electric, Inc.||Lamp socket|
|US4691086 *||Apr 3, 1986||Sep 1, 1987||Indak Manufacturing Corp.||Pushbutton electrical switch having a flairing contactor loosely rotatable on a spring-biased eyelet|
|US4692573||Dec 17, 1985||Sep 8, 1987||Kabushiki Kaisha Tokai Rika Denki Seisakusho||Interlock push-push switch device|
|US4713498||Oct 15, 1986||Dec 15, 1987||Square D Starkstrom Gmbh||Switch gear|
|US4754104||Jul 9, 1987||Jun 28, 1988||Continental-Wirt Electronics Corporation||Rotary switch with insulation displacement connectors|
|US4771141||Jul 31, 1987||Sep 13, 1988||Zanxx, Inc.||Push-push electrical switch|
|US4788403||Jan 20, 1987||Nov 29, 1988||Hy-Bec Corporation||Apparatus for automatic soldering|
|US4795860||Aug 25, 1987||Jan 3, 1989||Alps Electric Co., Ltd.||Push switch|
|US4812620||May 8, 1986||Mar 14, 1989||Hy-Bec Corporation||Concentrated radiant energy heat source unit|
|US4858090||Jun 22, 1988||Aug 15, 1989||Downs James W||Ellipsoidal reflector concentration of energy system|
|US4885443||Nov 29, 1988||Dec 5, 1989||Tokheim Corporation||Sealed backlit switch assembly|
|US4891018||Jun 16, 1988||Jan 2, 1990||Minnesota Mining And Manufacturing Company||Solderless electrical connector|
|US4891476||May 9, 1988||Jan 2, 1990||Illinois Tool Works, Inc.||Index rotary switch|
|US4906808||Aug 8, 1988||Mar 6, 1990||Electro-Mechanical Products||Tease-free switch|
|US4939328||Dec 23, 1988||Jul 3, 1990||Judco Manufacturing, Incorporated||Quiet switching apparatus and method of operation|
|US4978823||May 9, 1989||Dec 18, 1990||Alps Electric Co., Ltd.||Seesaw-type switch device having a snap-coupled actuator|
|US5001316||Apr 9, 1990||Mar 19, 1991||Kamada Ii, Inc.||Push switch with printed terminal board|
|US5043546||Jul 16, 1990||Aug 27, 1991||Oslo Controls, Incorporated||Push-button switch|
|US5049709||Jan 30, 1990||Sep 17, 1991||Illinois Tool Works, Inc.||Index rotary switch with rotor contact member having L-shaped arms|
|US5060289||May 4, 1990||Oct 22, 1991||Research, Incorporated||Portable tube shrinking tool|
|US5063276||Aug 20, 1990||Nov 5, 1991||Eaton Corporation||Pushbutton switch with rotational contact wiping action|
|US5132499||Dec 18, 1989||Jul 21, 1992||Judco Manufacturing, Inc.||Pre-loaded switching apparatus and method of operation|
|US5145059||Jan 22, 1991||Sep 8, 1992||Prince Corporation||Switch|
|US5158172||Jan 28, 1991||Oct 27, 1992||Otto Engineering, Inc.||Toggle switch|
|US5178265||Feb 4, 1991||Jan 12, 1993||White Consolidated Industries, Inc.||Push-push snap switch|
|US5186316||Dec 10, 1991||Feb 16, 1993||Lee Craft Manufacturing Co., Inc.||Stable-on push-push electrical switch|
|US5194703||Dec 17, 1990||Mar 16, 1993||Alcatel N.V.||Push-button arrangement|
|US5201408||Aug 21, 1991||Apr 13, 1993||Elektro-Apparatebau Olten Ag||Housing for electric switches|
|US5226529||Apr 19, 1991||Jul 13, 1993||Judco Manufacturing, Inc.||Stable on switch|
|US5268542||Jun 1, 1992||Dec 7, 1993||Mannesmann Aktiengesellschaft||Push button operated multi-step switch including flexible circuit board and extending push element|
|US5285037||Apr 10, 1992||Feb 8, 1994||Ampex Systems Corp.||Illuminated dome switch|
|US5293507||Feb 20, 1992||Mar 8, 1994||Alps Electric Co., Ltd.||Movable contact piece support structure of a seesaw switch|
|US5435747||Feb 4, 1992||Jul 25, 1995||N.V. Raychem S.A.||Electrically-protected connector|
|US5442150||Sep 7, 1993||Aug 15, 1995||Ipcinski; Ralph G.||Piezo electric switch|
|US5924557 *||Jan 14, 1998||Jul 20, 1999||Trw Inc.||Electrical switch with contact spring|
|1||"Tube Shrinking Systems" related to a Model 4825 easyShrink.TM. Workstation.|
|2||Eraser Company Inc., Syracuse New York, Glo-ring Infrared Heat tools.|
|3||Judco Manufacturing drawings (redacted) of prior switch assembly on sale at least as early as 2002 (4 sheets).|
|Cooperative Classification||H01H1/36, H01H13/52|
|Jul 20, 2007||AS||Assignment|
Owner name: JUDCO MANUFACTURING, INC., CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TITTLE, MICHAEL D.;REEL/FRAME:019632/0695
Effective date: 20070720
|Aug 3, 2012||FPAY||Fee payment|
Year of fee payment: 4
|Aug 29, 2016||FPAY||Fee payment|
Year of fee payment: 8